Shoulder bag



FIG. 1 is a front elevational view of a shoulder bag showing my new design;

FIG. 2 is a rear elevational view;

FIG. 3 is a front perspective view as seen from the left side of FIG. 1;

FIG. 4 is a top front perspective view, showing the bag in an open position; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a shoulder bag, as shown and described. 